Pressure-gage.



P. M. GASADY.

PRESSURE GAGE.

APPLICATION FILED MAY 4, 1914.

1,1 16,798. Patented NW10, 1914.

m ff@ M PHIIIP M. CASADY, OF MINNEAPOLIS, MINNESOTA.

PRESSURE-GAGE.

specification of Letters Patent.

Patented Nov. 10, 1914.'

Application led Hay .4, 1914. Serial N o. 836,049.

To all 'whom t may concern:

Be it known that I, PHILIP M, CASADY, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Pressure- Gages, of which the following is a specification.

My invention relates to gas -pressure gages of that type in which two connected columns of water indicate the force or pressure exerted by the gas upon the surface of one of the columns. The indication is always made by the displacement of the liquid, and thepressure determined by such displacement may either be that which ofi'- sets gravity operating upon-the column of liquid or a' pressure resulting from compression of a certain amount air, in aA gas-pipe receptacle.

It is the purpose of my invention to provide a metallic Iholder which 'shall be in the form of a longitudinal hollow member for receiving and holding `the glass tubes and the scale to be read, said hollow member providing a means of connecting the gage to tral member.

the gas-pipe in either supported' or suspended position,` and a passageway for the gas to the lexposed top of the column of water. one form of my 'invention the supporting standard may provide an aircompress'ion chamber, and separate passage-l ways be afforded therein for the gas. In the preferred form, however, a compression chamber is provided independent of the cenbe employed either Aas a gravity gage or a compression gage, the former being useful .for indicating very low pressureswhile the 3-3of Fig. 1 'viewed in'the direction of the arrow. y Fig. 4' is a sectional view of fied forni-.of my invention.

As illustrated, I provide a hollow central frame `nieinber 10 throu h which extends 'a passageway 11., prefera ly square in cross a modiof gas', such as In either case the gage may siongage, as 'may be desired;

section, asindicated'at 12in Fig. 3. The hollow member 10 is open at both ends and is provided with circular integrally threaded end portions 12 and 13,`in one or the other of Awhich is secured a screw plug 14C- which, by means of a washer 15 effects airtight closure of one end or the other of the hollow member 10. When it is desired to apply the gage to a lixture so that it will stand upright upon the same, the cap 14 is screwed into position, as indicated in Fig. 1, and the threaded end 12 is connected .with the gas fixture. pend the gage from below a pipe and xture, the cap -14-is screwed into theend 12 and the portion 13 is screwed upon the pipe fixture.

Preferably integrally cast upon the lower portion of member 10, are extensions 16 and 17 forming cups 1'8and 19in which are vof, which .are connected by a tube 22 extending across the-passageway 11 within member 10. At a point near the tcp ofv member 10 are similar extensions 23 and 24,- forming cups 25 and 26 which receive the u per ends of tubes 2O and 21. As clearly s own in Figsfl and 4, these tubes are eemented within cups-25 and-26 so that the ends do not reachy the bottoms ofsaid cups. In the nects tiie passageway 11 Within member 10 with the cup cavity 26. In this form, also, an additional casing portion 28, preferably forwardly curved, as indicated in F ig. 3, is cast integrally withthe 'central member 10 and the cup extensions 23 and 24,. The outwardly curvedv portion is provided with a shelf-like door 2 and forms a compression chamber 30. Anlpening .31 connects compression chamber 30\wi\th the bottom of cup 25. A screw 32 controls a vent in the-top of casing 28 whe1eby\\the chamber 30 may be .opened to atmospheric pressure for gravity use'of the gage, or closed for a gas-compres- In the form shown in Fig:` 30 is omitted and partitions 33 and' 34 close When it is desired to sus-` referred form,`a passage-way, 27 cona 4,'the chamber piassageway 11 outside of the sets of extenters cup cavity Q6; It thus is apparent 4that if end 12 is connected with. a gas-pipe and end 13 plugged, the gas may flow through` pipe 35 within cavity 26 and glass tube 21.

passageway 37 with the cupf-25 above glass tube 20.'A A screw 38 controls a vent yfrom cup 25 to permit the gage'to-4 operate either as -a compression or gravity gage. A similar screw 89 may be employed to control a vent into cavity Q6 for the-purpose ofreadily releasing the gas pressure, to make check tests or for other purposesl A scale 40 reading from zero in the. center in both directions may be-.secured direct-ly upon central member 10. Such a scale may .be Aeither for reading from the two columns of water in tubes 2O 'and Y2.1 gravity indications of the gas pressure, or for read ing from said columns indications of gas pressure the result of compression ofthe air in chamber 30or 11. A-ecalefor eachpurpose/may, if desired, be applied to the oppo; site sides of the memberyl, asindicated in Fig.'3.

The simplicity of my gage' will be apparent. `The central member comprises at once a .frame support, means for connecting the gage with thegas fixture and a passageway for .the gas to: the proper end of the column of water in the glass tube 21. The ends of the glass tubes 20 and; 21 aresecurely vheld andso protectedthat breakage of `said glass tubes lwill seldom or never take` place. The arrangement'of the air chamber 'and the screw-control vent therein makes a readily interchangeable gravity or air-compression gage. The gage is cheaply constructed and cannot get out of order.

1. 'as-pressure age comprisin a o low metgallic frame Ignelnber adaptegioto be connected at either 'end to a gas-pipe, projections 4adiacent the Aends of said frame member andl integeral therewith forming `alined pairs ofcup-like cavities, a pair of glass tubes having the ends thereof cemented in saidcavities, a tube connecting said cavities below the lower ends of said glass tubes,

. and the wall of said hollow member having an apertureconnecting the passageway with: in the hollow member with one. of the cup cavities above the end of one of the glass tubes.

the hollow member with one of the cup cavities above thezend of one of the glass tubes, and a casing forming a compression chamber having communication with' the cavity above the endof the other glass tube.

3. A gas-pressure gage comprising a hollow metallic frame member, adapted to be connected at either end to al gaspipe,pro jections adjacent the ends of said frame member and integral therewith forming alined pairs of cup-like cavities, a pair of glass tubes having the ends thereof cemented in 'said cavities, a tube connecting said cavities below the lower ends of said glass tubes, the wall of lsaid hollow member havin an aperture connecting the passageway wlthin the hollow member with one of the cup cavities above the end of one of the glass tubes,

a casing forming a compression chamber -having commumcatlon with. the cavity above the end of the other glass tube, and means foropening or closing said compression chamber to atmospheric pressure.

'In testimony whereof I aix my signature in presence of two witnesses.

' PHILIP M. CASADY.

Witnesses:

F. A. WHITELEY, H. A. BOWMAN. 

